//download.js v4.2, by dandavis; 2008-2016. [CCBY2] see http://danml.com/download.html for tests/usage

// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime

// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs

// v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support. 3.1 improved safari handling.

// v4 adds AMD/UMD, commonJS, and plain browser support

// v4.1 adds url download capability via solo URL argument (same domain/CORS only)

// v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors

// https://github.com/rndme/download


(function (root, factory) {

    if (typeof define === 'function' && define.amd) {

        // AMD. Register as an anonymous module.

        define([], factory);

    } else if (typeof exports === 'object') {

        // Node. Does not work with strict CommonJS, but

        // only CommonJS-like environments that support module.exports,

        // like Node.

        module.exports = factory();

    } else {

        // Browser globals (root is window)

        root.download = factory();

    }

}(this, function () {


    return function download(data, strFileName, strMimeType) {


        var self = window, // this script is only for browsers anyway...

            defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads

            mimeType = strMimeType || defaultMime,

            payload = data,

            url = !strFileName && !strMimeType && payload,

            anchor = document.createElement("a"),

            toString = function (a) {
                return String(a);
            },

            myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),

            fileName = strFileName || "download",

            blob,

            reader;

        myBlob = myBlob.call ? myBlob.bind(self) : Blob;


        if (String(this) === "true") { //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback

            payload = [payload, mimeType];

            mimeType = payload[0];

            payload = payload[1];

        }


        if (url && url.length < 2048) { // if no filename and no mime, assume a url was passed as the only argument

            fileName = url.split("/").pop().split("?")[0];

            anchor.href = url; // assign href prop to temp anchor

            if (anchor.href.indexOf(url) !== -1) { // if the browser determines that it's a potentially valid url path:

                var ajax = new XMLHttpRequest();

                ajax.open("GET", url, true);

                ajax.responseType = 'blob';

                ajax.οnlοad = function (e) {

                    download(e.target.response, fileName, defaultMime);

                };

                setTimeout(function () {
                    ajax.send();
                }, 0); // allows setting custom ajax headers using the return:

                return ajax;

            } // end if valid url?

        } // end if url?


        //go ahead and download dataURLs right away

        if (/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)) {


            if (payload.length > (1024 * 1024 * 1.999) && myBlob !== toString) {

                payload = dataUrlToBlob(payload);

                mimeType = payload.type || defaultMime;

            } else {

                return navigator.msSaveBlob ?  // IE10 can't do a[download], only Blobs:

                    navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :

                    saver(payload); // everyone else can save dataURLs un-processed

            }


        }//end if dataURL passed?


        blob = payload instanceof myBlob ?

            payload :

            new myBlob([payload], {type: mimeType});


        function dataUrlToBlob(strUrl) {

            var parts = strUrl.split(/[:;,]/),

                type = parts[1],

                decoder = parts[2] == "base64" ? atob : decodeURIComponent,

                binData = decoder(parts.pop()),

                mx = binData.length,

                i = 0,

                uiArr = new Uint8Array(mx);


            for (i; i < mx; ++i) uiArr[i] = binData.charCodeAt(i);


            return new myBlob([uiArr], {type: type});

        }


        function saver(url, winMode) {


            if ('download' in anchor) { //html5 A[download]

                anchor.href = url;

                anchor.setAttribute("download", fileName);

                anchor.className = "download-js-link";

                anchor.innerHTML = "downloading...";

                anchor.style.display = "none";

                document.body.appendChild(anchor);

                setTimeout(function () {

                    anchor.click();

                    document.body.removeChild(anchor);

                    if (winMode === true) {
                        setTimeout(function () {
                            self.URL.revokeObjectURL(anchor.href);
                        }, 250);
                    }

                }, 66);

                return true;

            }


            // handle non-a[download] safari as best we can:

            if (/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {

                url = url.replace(/^data:([\w\/\-\+]+)/, defaultMime);

                if (!window.open(url)) { // popup blocked, offer direct download:

                    if (confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")) {
                        location.href = url;
                    }

                }

                return true;

            }


            //do iframe dataURL download (old ch+FF):

            var f = document.createElement("iframe");

            document.body.appendChild(f);


            if (!winMode) { // force a mime that will download:

                url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);

            }

            f.src = url;

            setTimeout(function () {
                document.body.removeChild(f);
            }, 333);


        }//end saver


        if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)

            return navigator.msSaveBlob(blob, fileName);

        }


        if (self.URL) { // simple fast and modern way using Blob and URL:

            saver(self.URL.createObjectURL(blob), true);

        } else {

            // handle non-Blob()+non-URL browsers:

            if (typeof blob === "string" || blob.constructor === toString) {

                try {

                    return saver("data:" + mimeType + ";base64," + self.btoa(blob));

                } catch (y) {

                    return saver("data:" + mimeType + "," + encodeURIComponent(blob));

                }

            }


            // Blob but not URL support:

            reader = new FileReader();

            reader.οnlοad = function (e) {

                saver(this.result);

            };

            reader.readAsDataURL(blob);

        }

        return true;

    };

}));
/* end download() */